PO-0966: Partial breast irradiation at the 1.5T MR-Linac: treatment time and electron stream effect. (November 2020) - De Colle, C.; Nachbar, M.; Mönnich, D.; Boeke, S.; Gani, C.; Weidner, N.; Heinrich, V.; Winter, J.; Tsitsekidis, S.; Dohm, O.; Thorwarth, D.; Zips, D.